Class: TupleList

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/tuplelist.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(required_keys, args = {}) ⇒ TupleList

Returns a new instance of TupleList.



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# File 'lib/tuplelist.rb', line 6

def initialize(required_keys, args = {})
  @keys = required_keys
  @current_tuple = {}
  @tuple_list = []

  @ignore = (args.delete :ignore) || false
end

Instance Attribute Details

#keys ⇒ Object (readonly)

Returns the value of attribute keys.



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# File 'lib/tuplelist.rb', line 2

def keys
  @keys
end

Instance Method Details

#[]=(key, value) ⇒ Object 



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# File 'lib/tuplelist.rb', line 14

def []=(key, value)
  if @keys.include? key
    @current_tuple[key] = value
  else
    raise "Unspecified key '#{key}' entered" unless @ignore
  end
end

#each ⇒ Object 



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# File 'lib/tuplelist.rb', line 28

def each
  @tuple_list.each do |tuple_hash|
    yield tuple_hash.values_at(*@keys)
  end
end

#next ⇒ Object 



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# File 'lib/tuplelist.rb', line 22

def next
  raise "No keys for #{@current_tuple.keys | @keys} specified" unless @current_tuple.length == @keys.length
  @tuple_list << @current_tuple
  @current_tuple = {}
end